America's big Democrat controlled cities are losing population.
As jobs go away, as the cities decline, those who can often move out. Sometimes they move to nearby suburbs, sometimes they flee to a more prosperous region.
This explains why Democrats eagerly cut corners to recruit massive numbers of immigrants and refugees into America.
Congressional representation is based on total population, not just citizen count.
Immigrants and refugees are a quick way for Democrat controlled cites to boost their sagging populations, and maintain congressional clout.
In other words, immigrants and refugees don't have to become citizens, don't have to vote to play part in swaying elections or strengthening threatened clusters of the Democrat political power base.